public static void Crop(Glyph glyph)
{
// Crop the top.
while ((glyph.Subrect.Height > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new System.Drawing.Rectangle(glyph.Subrect.X, glyph.Subrect.Y, glyph.Subrect.Width, 1)))
{
glyph.Subrect.Y++;
glyph.Subrect.Height--;
glyph.YOffset++;
}
// Crop the bottom.
while ((glyph.Subrect.Height > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new System.Drawing.Rectangle(glyph.Subrect.X, glyph.Subrect.Bottom - 1, glyph.Subrect.Width, 1)))
{
glyph.Subrect.Height--;
}
// Crop the left.
while ((glyph.Subrect.Width > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new System.Drawing.Rectangle(glyph.Subrect.X, glyph.Subrect.Y, 1, glyph.Subrect.Height)))
{
glyph.Subrect.X++;
glyph.Subrect.Width--;
glyph.XOffset++;
}
// Crop the right.
while ((glyph.Subrect.Width > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new System.Drawing.Rectangle(glyph.Subrect.Right - 1, glyph.Subrect.Y, 1, glyph.Subrect.Height)))
{
glyph.Subrect.Width--;
glyph.XAdvance++;
}
}
public static BitmapContent ArrangeGlyphs(Glyph[] sourceGlyphs, bool requirePOT, bool requireSquare)
{
// Build up a list of all the glyphs needing to be arranged.
var glyphs = new List<ArrangedGlyph>();
for (int i = 0; i < sourceGlyphs.Length; i++)
{
var glyph = new ArrangedGlyph();
glyph.Source = sourceGlyphs[i];
// Leave a one pixel border around every glyph in the output bitmap.
glyph.Width = sourceGlyphs[i].Subrect.Width + 2;
glyph.Height = sourceGlyphs[i].Subrect.Height + 2;
glyphs.Add(glyph);
}
// Sort so the largest glyphs get arranged first.
glyphs.Sort(CompareGlyphSizes);
// Work out how big the output bitmap should be.
int outputWidth = GuessOutputWidth(sourceGlyphs);
int outputHeight = 0;
// Choose positions for each glyph, one at a time.
for (int i = 0; i < glyphs.Count; i++)
{
PositionGlyph(glyphs, i, outputWidth);
outputHeight = Math.Max(outputHeight, glyphs[i].Y + glyphs[i].Height);
}
// Create the merged output bitmap.
outputHeight = MakeValidTextureSize(outputHeight, requirePOT);
if (requireSquare)
{
outputHeight = Math.Max (outputWidth, outputHeight);
outputWidth = outputHeight;
}
return CopyGlyphsToOutput(glyphs, outputWidth, outputHeight);
}
// Heuristic guesses what might be a good output width for a list of glyphs.
static int GuessOutputWidth(Glyph[] sourceGlyphs)
{
int maxWidth = 0;
int totalSize = 0;
foreach (Glyph glyph in sourceGlyphs)
{
maxWidth = Math.Max(maxWidth, glyph.Bitmap.Width);
totalSize += glyph.Bitmap.Width * glyph.Bitmap.Height;
}
int width = Math.Max((int)Math.Sqrt(totalSize), maxWidth);
return MakeValidTextureSize(width, true);
}
